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Black strips across roads

By Evil_Kitten - 27 September 2012 36

What are the temporary black strips across roads for?

There’s usually two of them parallel to each other and they’re attached to a box that’s off the road.

Are they just to monitor the amount of traffic?

Are they speed related in any way?

What’s Your opinion?


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36 Responses to
Black strips across roads
Dougal 11:22 pm 27 Sep 12

Pardon my ignorance, but I don’t understand how could these tubes could record the speed of a vehicle if they can’t determine the chassis length? A motorbike, a ‘smart’ car, an average car, a bus – wildly different distances between the tyres.

I just always assumed that they were for counting purposes, and that perhaps tube two was a backup for tube one.

dks00k 9:35 pm 27 Sep 12

A common use of these is to monitor traffic flow prior to re-sealing the road surface. This typically allows RTA / TAMS / Contractor etc to apply an appropriate amount of bitumen and aggregate for the traffic conditions.

Particularly with the warmer weather approaching its a fair bet if you have these in your street you will soon be able to drive by and flick stones up at oncoming cars and cyclists.

troll-sniffer 7:49 pm 27 Sep 12

Sgt.Bungers said :

They’re “Pneumatic Road Tube Counters” which register vehicle axle movements.

As you’ve suggested, they’re used to count the number and types of vehicles using the road, as well as vehicle speeds.

I used to think that was the case until I had a closer look one day and discovered that one end of the tubes seems to be planted in the ground. So I asked a nearby Ranger and he confided that they are in fact nitrogen fertilisers for nearby trees. Since air contains 70% nitrogen, a pressurised injection of nitrogen laden gas (air) to the roots saves on fertiliser. If you look at just about any of these installations you’ll see that there is usually a tree nearby, often in less than perfect condition. Just be glad your driving habits are contributing to the nation’s trees bit by bit.

Ozi 6:05 pm 27 Sep 12

they often have a Near Field Communication or Radio Frequency ID capability built in, allowing the government to track everyone driving over them. It gets stored indefinitely in the 8 million square kilometre data centre that also stores all your GPS phone data and every call, SMS and email you ever made ever. EVVVERRRRRRRR….

*cue x-files music*

Evil_Kitten 5:33 pm 27 Sep 12

RandomPoster said :

If there is one, it is just for traffic volume and if there are two then it is speed also.

That makes sense. So what if there’s 4? This road has a set of 2 in one spot and another set of 2 a bit further along. I guess they’re just seeing the amount of traffic & speeds in 2 different spots?

There’s no point to point monitoring going on?

Evil_Kitten 5:30 pm 27 Sep 12

dpm said :

“Are they speed related in any way?”

Hahahaha! Someone got a guilty conscience?? 🙂

Hahaha no I always speed and my conscience feels no guilt about it 😛

carnardly 5:28 pm 27 Sep 12

there are a couple at intersections on Melrose Drive that are connected to cameras of some sort. I don’t think they’re the regular speed ones but you never know.

shirty_bear 5:13 pm 27 Sep 12

SnapperJack said :

This was the way cops used to issue speeding tickets before radar and speed cameras. It was called an Amphometer and was used until the early 1990s. The tubes would be laid across the road and further on the cops would be in a car monitoring the speed of cars passing over it. They would then flag down cars that were speeding and issue the drivers with speeding tickets.

My recollection is that amphometer strips used to be a lot further apart than the traffic counters we see.

Don’t have a problem with these traffic counters collecting approximate speeds, but I don’t think there’s any way they could be used for ticket-issuing. Determining camera/cushion placements … probably.

rhino 4:56 pm 27 Sep 12

f4te said :

Sgt.Bungers said :

As you’ve suggested, they’re used to count the number and types of vehicles using the road, as well as vehicle speeds.

So slow down when you see them, otherwise they’ll put in more speed bump/cameras.

This.

dpm 4:36 pm 27 Sep 12

“Are they speed related in any way?”

Hahahaha! Someone got a guilty conscience?? 🙂

SnapperJack 4:33 pm 27 Sep 12

This was the way cops used to issue speeding tickets before radar and speed cameras. It was called an Amphometer and was used until the early 1990s. The tubes would be laid across the road and further on the cops would be in a car monitoring the speed of cars passing over it. They would then flag down cars that were speeding and issue the drivers with speeding tickets.

f4te 4:31 pm 27 Sep 12

Sgt.Bungers said :

As you’ve suggested, they’re used to count the number and types of vehicles using the road, as well as vehicle speeds.

So slow down when you see them, otherwise they’ll put in more speed bump/cameras.

RandomPoster 4:25 pm 27 Sep 12

If there is one, it is just for traffic volume and if there are two then it is speed also.

artuoui 4:08 pm 27 Sep 12

Sgt.Bungers said :

They’re “Pneumatic Road Tube Counters” which register vehicle axle movements.

As you’ve suggested, they’re used to count the number and types of vehicles using the road, as well as vehicle speeds.

And all the kids who jump on them.

Sgt.Bungers 3:57 pm 27 Sep 12

They’re “Pneumatic Road Tube Counters” which register vehicle axle movements.

As you’ve suggested, they’re used to count the number and types of vehicles using the road, as well as vehicle speeds.

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